diff --git a/compiler/optimizing/instruction_simplifier.cc b/compiler/optimizing/instruction_simplifier.cc
index 2b6ae20..4c6d6ba 100644
--- a/compiler/optimizing/instruction_simplifier.cc
+++ b/compiler/optimizing/instruction_simplifier.cc
@@ -749,8 +749,8 @@
       return new (allocator) HBelowOrEqual(rhs, lhs);
     default:
       LOG(FATAL) << "Unknown ConditionType " << cond->GetKind();
+      UNREACHABLE();
   }
-  return nullptr;
 }
 
 static bool CmpHasBoolType(HInstruction* input, HInstruction* cmp) {